This book is written with a view to eliminate all the "-isms." These include extremism, leftism, rightism, and centralism as well, among the others.
When reading this, think of it like a mind map of political concepts. You don't have to agree with all of this to get something out of it.
Chapter 1 is the overview of the ideas.
Chapter 2, 3 and 4 are timeless constituentes separating culture and community. One issue at a time.
Chapter 5 focuses on proposed way of life and solutions to political issues we face.
Put simply,
Right-wing and left-wing ideologies are either incomplete and/or misunderstood and/or miscommunicated.